is evaluated from (REF ) using the subprocess amplitudes (REF )
and (REF ) as well as the DAs and form factors described in Sec. .
The resulting cross sections for the various pion channels, scaled by \(s^7\)  in order to take away
most of the energy dependence,
are displayed in Figs. REF  and REF  as solid lines and compared
to experiment [1]}, [2]}, [3]}. Of course, there is agreement with the CLAS data
[1]} since the expansion coefficient \(\omega _{20}\)  is fitted to these data. On the other
hand, there is substantial disagreement with the SLAC data [2]}. In particular the
SLAC \(\pi ^0\)  data are about an order of magnitude larger then the new CLAS data in the vicinity
of 90 degrees. With regard to the prerequisite of the handbag approach that the Mandelstam
variables should be much larger than the hadronic scale, \(\Lambda ^2\) , we only show results for
\(-t\)  and \(-u\)  larger than \(2.5\,\,{\rm GeV}^2\) . This is a compromise between the requirement of the
handbag approach, on the one side, and having available a not too small range of \(\cos {\theta }\) 
for the experimentally accessible values of \(s\)  on the other side.
